[10969] Some cleanups in MailDraft API

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автор: VladimirMangos

m src/game/AuctionHouseHandler.cpp

m src/game/AuctionHouseMgr.cpp

m src/game/Level1.cpp

m src/game/Level3.cpp

m src/game/Mail.cpp

m src/game/Mail.h

m src/game/Player.cpp

m src/shared/revision_nr.h

[10969] Some cleanups in MailDraft API



* Use Set* names for cases when function replace old value by new (instead Add*)

* Prevent hidden MailDraft copy create becase if draft have items its can't be just shared

  and need preoprtly cloned, but item close is high price operation (guid use, DB tiuched and etc)

  So this must be explictly operation. In next commits will be added clone function for this.

* Some MailDraft overwrite by assign cases rewrited to more clean way.

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